I have a Truth operator on Wenco casement in 1993 (home bought new 1993) The longest bar is 9 1/2" Any chance you could replace both left and right operators.
Tom from SWISCO responded:
June 29, 2017
Thanks for contacting us. Without having a clear view of you operator, I'm guessing our 39-027E and 39-028E may work. I suggest you remove your operator from the window to match the dimensions to your part.